Example.cs

using GooglePlayServices;
using UnityEditor;
using UnityEngine;

internal static class Example
{
    [MenuItem( "Tools/Hoge" )]
    private static void Hoge()
    {
        PlayServicesResolver.Resolve
        (
            resolutionComplete: () => Debug.Log( "完了" ),
            forceResolution: true // 「Force Resolve」を呼び出すなら true を渡す
        );
    }
}